ML20214Q142

Dissolved Hydrogen Concentration in Arkansas Nuclear One Unit 2 Pressurizer Repair Welds

ML20214Q142
Person / Time
Site:	Arkansas Nuclear
Issue date:	05/21/1987
From:	MPR ASSOCIATES, INC.
To:
Shared Package
ML20214Q133	List: 2CAN058706, Forwards Dissolved Hydrogen Concentration in Arkansas Nuclear One Unit 2 Pressurizer Repair Welds, Demonstrating Adequacy of Weld Repairs.Final Stress Calculation for X1 & T4 Heater Location Repairs Also Encl ML20214Q142 ML20214Q155 ML20214Q158
References
NUDOCS 8706040249
Download: ML20214Q142 (17)

Text

_ _ _ _ _ _ _ _ _ -.

HYDROGEN EMBRITTLEMENT ANALYSIS

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8706040249 870521 PDR ADOCK 05000368 P

PDR

M P R AseOCIATES, INc.

May 21, 1987 DISSOLVED HYDROGEN CONCENTRATION IN ANO UNIT 2 PRE 550RIZER REPAIR WELOS INTRODUCTION Two pressurizer heater penetrations in the ANO-2 pressurizer will be repaired by welding. The repair geometry is shown in Figure 1 and consists of a low alloy steel plug welded into the heater penetration.

The welding technique for the repair is the half-bead temper technique which leaves the weld and heat af fected zone with substantial residual stresses. Questions have been raised regarding the potential susceptibility of the weld repair to hydrogen cracking. The plug, repair weld and pressurizer shell are all low alloy steel and will be exposed to borated primary coolant. By following ASME Code rules for the repair welds, hydrogen concentrat ans in these welds will be acceptably low after these repairs.

In this report, a conservative calculation of the hydrogen generation and diffusion occurring in the repair area will be made for subsequent plant operation after the repairs, and the maximum hydrogen concentration in the weld will be calculated herein.

This maximum expected concentration will be compared to the threshold hydrogen concentration for cracking in highly stressed material which is representative of the worst-case postulated to exist in the weld area including the heat af fected zone.

METHOD The methodology used for this calculation is the same as that developed by Westinghouse for the analysis of cladding penetrations in the Yankee Rowe reactor vessel and pressurizer (References 1 and 2), and from subsequent Westinghouse work on this subject (Reference 3).

The analysis considers the sources of hydrogen generation in all exposed alloy steel surfaces for the operating condition tabulated below.

For significant sources of hydrogen, the diffusion gradient of the hydrogen content in the metal is considered between the source surface and the wel d.

Operating Condition Temperature Dis _ sol ved H7 in Coolant Normal Operation 653'F 45 cc/kg J

m svW M 3rrTD.r.

m cr49 CALCULATION The analysis proceeds by considering: (1) the sources of hydrogen; (2) the hydrogen generation rate from each source at wetted surfaces; (3) hydrogen diffusion into the weld; and (4) comparison of total Eacn of these dissolved hydrogen to the critical value for cracking.

steps is covered below:

1.

Sources of Hydrogen -- There are two possible sources of hydrogen in the pressurizer environment: that resulting from direct charging of metal surf aces by hydrogen gas dissolved in the coolant and that resulting from corrosion of alloy steel surfaces. Hydrogen resulting from radiolytic decomposition of water is judged to be minimal in the relatively low radiation field of the pressurizer.

2.

Hydrogen Gener1 tion Rate -- Westinghouse has shown that the hydrogen generation rate resulting from direct permeation of water-borne hydrogen into the alloy steel is small (References 1 and 2). However, in order to simplify the calculations in a conservative manner, it will be assumed that, from the permeation source, the hydrogen concentration everywhere in the repair area is the maximum sustainable by the partial pressure of hydrogen in the coolant, and no losses due to diffusion, out of the metal.at air surfaces will be considered.

Dissolved hydrogen in the alloy steel due to corrosion of wetted surfaces is another source, and more detailed calculations must be performed for hydrogen generation rates at the surface of the weld. Westinghouse in References 1 and 3 provides a detailed discussion of the corrosion of carbon steel in aerated and deaerated boric acid solutions at ambient and alevated temperatures. These values were used in the analysis.

The critical, actively corroding surface in the pressurizer repair area is the plug crevice. This surface is closest to the weld and

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is the source of most absorbed hydrogen.

It will be assumed that 2

this surface corrodes at a rate of 150 mg/dm -mo during normal operation, the same as was assumed to be conservative by Westinghouse in Reference 1.

This is a conservative rate for the corrosion of free carbon steel surfaces in hot borated water, and is especially conservative for the plug crevice considering the low oxygen accessibility in the crevice and the fact that it will rapidly fill with corrosion products.

3.

Hydrogen Diffusion -- The hydrogen concentration at the wetted surf ace of the weld will be calculated by conservatively assuming that the weld is a four-inch slab (approximately the pressurizer wall thickness) completely wetted on one face.

The surface concentration of hydrogen can be determined by the methods in References 1 and 2, and the calculation is attached.

Critical Hydrogen Level -- A literature review was performed to, hat 4.

determine the critical hydrogen levels in high strength steels t The results would lead to cracking under high stress conditions.

of this review are attached.

It is concluded that critical hydrogen levels during welding are extremely conservative and appropriate for detennining ANO weld repair limits, since the. test welds used to develop the limits were subject to extremely high stresses upon cooling, and they contain much untempered, brittle martensite.

Based on our review, a critical level of dissolved hydrogen of 7.2 ppm will be used in the ANO analysis.

RESULTS The permeated hydrogen in the weld at saturation conditions 1.

appropriate for the amount of dissolved hydrogen in the coolant is:

C (permeation) = 0.308 ppm The corrosion induced hydrogen concentration is conservatively 2.

calculated to be:

C (corrosion) = 0.36 ppm The total hydrogen at the wetted surf ace of the weld is the sum of 3.

the two source terms Cgog = 0.67 ppm This value is over an order of magnitude less than the critical hydrogen level for hydrogen cracking. Considering the conservatism used to calculate welo hydrogen levels, it is clear that adequate safety margin exists for the operation of the pressurizer.

REFERENCES

" Evaluation of Yankee Vessel Cladding Penetrations," Westinghouse 1.

Electric Corporation, Atomic Power Division, Pittsburgh, PA, dated October 15 1965 (WCAP 2855).

" Yankee Pressurizer Cladding Evaluation," Westinghouse Electric 2.

Corporation, Atomic Power Division, Pittsburgh, PA, dated November 2,1965 (WCAP 2859).

" Absorption of Corrosion Hydrogen by A3028 Steel at 70' to 500*F,"

3.

Westinghouse Electric Corporation, Atomic Power Division, Pittsburgh, PA, dated Dece-ber 1, 1967 (WCAP 7099).

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